NFL Games
Super Bowl XLVII: San Francisco 49ers vs. Baltimore Ravens
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In this Friday, Aug. 10, 2012, photo, San Francisco 49ers head coach Jim Harbaugh wears a headset during an NFL football game against the Minnesota Vikings in San Francisco. The NFL is switching from the old analog system coaches used to relay plays to their quarterbacks and launching a network that runs on digital technology. (AP Photo/Paul Sakuma)
